In one of the best written eBay listings I've seen, my seller wrote:
" If you’re concerned about fuel economy, I urge you to balance the miserly sipping of fuel with having your head firmly pressed against the electronically adjustable leather headrest as you challenge (and beat) earths’ gravitational forces."
I got about 17 on the way home . . .
Well said. I for one believe that you should enjoy your AMG the way it should be enjoyed without concern for your gas consumption. Otherwise, get a Prius. That said, I still find it interesting to know my mpg. I average 14 (mixed) on my 500E.